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Attention-Deficit/Hyperactivity Disorder (ADHD) — Diagnosis & Management

System: Psychiatry • Reviewed: Nov 30, 2025 • Step 1Step 2Step 3

Synopsis:

Neurodevelopmental disorder characterized by developmentally inappropriate inattention, hyperactivity, and impulsivity; diagnose using DSM-5 criteria with symptoms present in ≥2 settings, impairing function, and beginning in childhood; management includes behavioral therapy, environmental supports, and stimulant or non-stimulant pharmacotherapy tailored to age, comorbidities, and functional goals.

Key Points

  • ADHD diagnosis requires DSM-5 criteria and impairment in ≥2 settings.
  • Rule out learning disorders, sleep disorders, mood/anxiety disorders, thyroid abnormalities, and substance misuse.
  • Stimulants are first-line for most patients ≥6 years old.
  • Behavioral therapy is first-line for preschool-aged children.
  • Monitor growth, cardiovascular parameters, and mental health during treatment.

Algorithm

  1. Identify inattentive and/or hyperactive-impulsive symptoms.
  2. Obtain collateral history (parents, caregivers, teachers, partners, workplace).
  3. Assess for comorbid psychiatric, developmental, and medical conditions.
  4. Exclude mimics (sleep disorders, thyroid dysfunction, mood disorders, substance use).
  5. Apply DSM-5 criteria and confirm functional impairment in ≥2 settings.
  6. Initiate behavioral and/or pharmacologic therapy depending on age and severity.
  7. Monitor response, tolerability, academic/work functioning, and comorbidities.

Clinical Synopsis & Reasoning

ADHD is a chronic neurodevelopmental disorder presenting with patterns of inattention and/or hyperactivity-impulsivity that interfere with functioning or development. Diagnosis is clinical using DSM-5 criteria, requiring ≥6 symptoms (or ≥5 for adults), impairment across ≥2 settings, onset before age 12, and exclusion of mimics such as learning disorders, sleep disorders, anxiety, depression, thyroid disease, and substance use. Core evaluation includes detailed history, collateral information, school/occupational reports, and screening for comorbidities including ODD, learning disorders, mood and anxiety disorders, and autism spectrum disorder.


Treatment Strategy & Disposition

Management integrates behavioral, educational, and pharmacologic strategies. For preschool children, behavior therapy is first line. For school-age children, adolescents, and adults, stimulants (methylphenidate or amphetamine formulations) are first-line, with non-stimulants (atomoxetine, guanfacine ER, clonidine ER, bupropion) used based on tolerability, comorbidities, or contraindications. Coordinate with schools/employers for structured support and academic accommodations. Monitor growth, appetite, sleep, blood pressure, heart rate, and psychiatric symptoms longitudinally.


Epidemiology / Risk Factors

  • Affects approximately 5–7% of children globally and persists into adulthood in ~60% of cases.
  • High heritability (~70–80%).
  • Commonly coexists with learning disorders, anxiety, depression, and sleep disorders.

Investigations

AssessmentRole / RationaleTypical FindingsNotes
Clinical interview + DSM-5 symptom checklistPrimary diagnostic toolSymptom clustersRequires impairment in ≥2 settings
Collateral reports (parent, teacher, employer)Confirm cross-setting symptomsConsistent inattentive or hyperactive-impulsive behaviorUse validated scales (e.g., Vanderbilt, Conners)
Screening for comorbiditiesIdentify co-occurring conditionsAnxiety, learning disorders, mood symptomsGuides therapy and referral
Sleep assessmentExclude sleep apnea and insomniaSnoring, poor sleep hygieneSleep disorders mimic inattention/hyperactivity
Thyroid studies (TSH) as indicatedExclude thyroid dysfunctionNormalCheck when symptoms atypical or systemic
Vision/hearing assessmentExclude sensory impairmentNormalImportant in children with academic difficulties

DSM-5 Diagnostic Criteria Overview

DomainCriteria
Inattention≥6 symptoms (≥5 for adults) for ≥6 months, inconsistent with developmental level
Hyperactivity/Impulsivity≥6 symptoms (≥5 for adults) for ≥6 months
Additional RequirementsSymptoms present before age 12, in ≥2 settings, causing impairment, not better explained by another disorder

Pharmacology

MedicationMechanismOnsetRole in TherapyLimitations
Methylphenidate formulationsBlock reuptake of dopamine/norepinephrineRapid (days)First-line for most patientsAppetite suppression, insomnia, CV monitoring
Amphetamine formulationsIncrease synaptic dopamine/norepinephrineRapidFirst-line alternativeHigher risk of appetite and sleep effects
AtomoxetineSelective norepinephrine reuptake inhibitorWeeksGood for anxiety, tic disorders, substance-use riskBlack-box warning for suicidal ideation in youth
Guanfacine ERα2A-agonist improving prefrontal regulationWeeksAdjunct for hyperactivity/impulsivity, sleep benefitSedation, hypotension
Clonidine ERα2-agonistWeeksAdjunct or alternative when stimulants poorly toleratedSedation, hypotension
BupropionNorepinephrine/dopamine reuptake inhibitionWeeksUseful in adults with depression or smoking cessationAvoid in seizure disorders

Prognosis / Complications

  • Symptoms often persist but can be effectively managed with structured supports and medications.
  • Untreated ADHD increases risk of academic underachievement, occupational impairment, accidents, and mood disorders.
  • Early treatment improves long-term academic and psychosocial functioning.

Patient Education / Counseling

  • Explain that ADHD is a neurodevelopmental disorder—not a result of poor effort or parenting.
  • Discuss medication expectations: onset, duration, monitoring needs, and common side effects.
  • Review importance of sleep, physical activity, structured routines, and reduced distractions.
  • Collaborate with families/schools/employers for environmental supports.
  • Address emotional health, stigma, and potential comorbid conditions.

Notes

ADHD diagnosis requires integration of clinical history, collateral information, and structured rating scales—no single test is diagnostic. Treatment benefits from multimodal strategies including behavioral interventions, medication, environmental modification, and academic/workplace supports. Periodic reassessment is essential due to evolving developmental demands and comorbidities.


References

  1. American Academy of Pediatrics Clinical Practice Guideline for the Diagnosis, Evaluation, and Treatment of ADHD in Children and Adolescents (2019) — Link
  2. National Institute for Health and Care Excellence (NICE) Guideline NG87: Attention Deficit Hyperactivity Disorder (2018, updated) — Link
  3. Faraone SV et al. The World Federation of ADHD International Consensus Statement: 208 Evidence-Based Conclusions About ADHD. Neurosci Biobehav Rev. 2021. — Link

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